(Seachrome of the Dead isn't a spell.)
Seachrome of the Dead enters the battlefield tapped unless you sacrifice a colorless permanent.
All creatures have Plainswalk.
: Add to your mana pool.
: Add or to your mana pool. Each opponent gains 1 life.
: Add 
to your mana pool.: Add 
or 
to your mana pool. Each opponent gains 1 life.
